Add viewBox(...) helper function to d3.selection.prototype.
Add x(...), y(...) helper functions to d3.selection.prototype.
Add id(...) helper function to d3.selection.prototype.
Add width(...) helper function to d3.selection.prototype.
Add height(...) helper function to d3.selection.prototype.
Refactor d3.js wrapper with funcFactory(...), oh yeah!
Add class(...) helper function to d3.selection.prototype.